maureen naylor is live in san bruno with more. >> reporter: we have seen a lot of the devastation zone. behind me, you can see this heavy equipment was brought in. that was just brought in today to start the cleanup, official cleanup process for the neighborhood tomorrow. 37 homes here were destroyed. work on three of them begins tomorrow. workers in riot gear hosed down to clean up toxicity. >> we were hoping to start today. the site is not ready unless we can do it 100% correct, we're not gonna do it. >> reporter: some damaged cars were removed but those completely charred won't be taken away until tomorrow. crews will had use these devices to check air quality. >> this will monitor any fugitive dust or emissions coming off the site and we'll be able to collect them and find out if there's anything truly hazardous. >> while the cleanup preparations were underway, this resident was at a nearby gymnasium talking with his health representative. he says his biggest concern is his roommate who was severely injured. >> he had like 75% burn. he's in critical condition. he had had a stroke.